s() believe they were not the first animals on Earth 首字母填空,

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s() believe they were not the first animals on Earth 首字母填空,

s() believe they were not the first animals on Earth 首字母填空,
s() believe they were not the first animals on Earth 首字母填空,

s() believe they were not the first animals on Earth 首字母填空,
Scientists
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Some,尤其是后面的句子里也有Some或者the other的话

scientists believe they were not the first animals on Earth